Complete detached adjustable arch frame



Aug. 20, 1935. I A. H. CHRISTENSEN 2,011,796

COMPLETE DETACHED ADJUSTABLE ARCH FRAME v Filed Oct. 2, 1934 ,lzn/y /z (A ma/[Wary BY 1 AWTTQRNEK PATENT orrics;

" COMPLETEDETAOHED ADJUSTABLE Anon- --'FRAME;".1..

, Alvin' Hans Christensen, Denver, Colo.

v Application October 2, 1934, Serial No. 74 ,520

v 3lClaims. (0112-116) invention relates to a standard form for use in transforming square wall openings into plaster arch openings. The forms forplaster ,archopenings are' fusually designed and con structedby the carpenter on the job. Since all f carpenters are not skilled designersfthis' usually results injan arch which isnnot architecturally" correct, {and in arches throughoutthe-building which are not uniform. 1

The' p'rincipal object of this invention is, to provide a complete detached adjustable arch frame which can be marketed as a complete unit and vwhich'can bequickly set up. in a. square partition opening and adjusted to suit the desired heighth and width of opening, as'wellas'the desired'wall 7 "thickness. 'With the use of this invention, all

arched openings ina' building will be similar in gdesign so that uniform, architecturally correct arches are obtained in much less time than formerly required.

In'remodeling old buildings, it is often desired to change square cased openings and doorways intoplaster arches; In order to do this, it is necessary to employ a carpenter to place the arch framesfor the decorator to fill in with plaster, putty, etc. The usualdecorator is unable to construct a satisfactory arch frame, and the job usually requires a 'full days time of a carpenter.

Another object of this invention is to provide a frame unit which can be purchased by the decorator, adjusted to fit any desired opening or wall,

and quickly set in place so that he may proceed with hisplastering, papering, etc., without requiring the services of a carpenter.

Other objects and advantages reside in the detail construction of -theinvention, which is designed for simplicity, economy, and efliciency.-

' 7 These will become more apparent from the follow- 'ing description.

, drawing and throughout the description.

, Fig. 1 is a perspective view of the complete arch M In the drawing:-

' unit partially broken away to show the interior construction thereof.

. Fig. 2 illustrates a wall with a plaster arch opening in which the invention is embodied.

Fig. 3 is a horizontal section, taken on the line 3 -3, Fig. 1. a

Fig. 4 is a vertical section, taken on the line 4-4, Fig. 1.

: The invention contemplates the use of two of theunits of Fig. l for each archway, each unit supplying one-half of the arch form. Each unit consists of two similar wall sections overlapped on each other so that the complete unit is adjustable as to width. The first wall section consists of a side jamb 'piece' ID secured at right angles to a head jamb 13. In the rectangular joint an arch block"l.6 is positioned to define the curve of the desired arch. The wall face of the section is coveredby a sheet of wall board 18, such as ""Cellotex or the'like and the'arch face of the jamb pieces In andl3 and the arch block I! are covered by a strip of similar wall rated or zig-zag edge! 1 The second section of each unit is similar to the first section except reversed. It comprises a side jamb piece ll a head jamb piece l4 and an arch block I! covered by strips of wall board 18 and 20. The wall board strip 20 is serrated or zig-zagged to fit into the serrations of the strip l9 when the two sections are together to form a broken joint line 2|. The two coacting side jamb pieces join along a vertical ship lap joint l2 and'the two coacting head jamb pieces joint along a horizontal ship lap joint Hi.

It can be readily seen that with the above construction the two sections of the unit can be slid apart or pushed together to adjust the unit to any desired total thickness. The serrated edges of the wall board strips 1 Sand 20 and the ship lap joints between the jamb members form a slip joint connection between the two sections- The corners of each unit. ofthe arch are outlined by means of metal corner beads 22 permanently secured over the corners of the wall board strips and extend completely around the arch corners of the unit. The vertical side jambs if! and II are furnished of a length equal to the greatest expected heighth of arch and the head' opening. The units of the form are then set in place at each side of the opening, and either widened or narrowed, until the extreme width of the corner'beads2zequals the plaster width of the wall (indicated at C, Fig. 3).

The side and head jambs are then nailed directly to the wall studding and the arch is ready to receive the plaster or decorating putty, which, when in place,

covers the form to the depth of the projection of board I 9 having a I ser- While a specific form of the improvement has 7 been" described and illustrated he 'eingit is desired to lee-understood .that the same 'n' aylo'ef :15. 1varied,,withi n the scope of the appended:claims;

the came as '22; as indicated by t e broken and along said head jambl;

Itis desii'ed to .callfparticnlar attention toq the broken'joining line 2l.' It.h-as been found that plaster cracks form and iollow along a straight line of the nndersurface. ,Withthe presl entl invention, however, should any cracks start on thearch face theyare soon interrupted byjthe ,1 turnsof thebrol ien joint 2i. irreglnlai line also provides aseeflre key tojhold the plaster sur facein place.

without departing from the spirit of. the inven- Having' thus described tli'e iniientiorf, what is claimed anddesii edv secured by-'Lette rsl3at 1;

a 1; i An iadjustahle are-h fo'rm'i'or buildin'gs Zoom- "prising: a l'pair. of vertical jamdmembers a;pair,

of headjamb members joining said-.vertical'jamb Inembe'fs to form" a rectangular "corner; vLa "slip joint between said ja' r'nb'niembers so thafiithe (to- T" 'tal 'jarnbwidth can; ldeQincreas'ed 'or' v'dec'i eased as ydsired; archiblocks insetatithe joinin of said; side Tandihead jambgmembers 'a. facing strip; on? Y the archfface of; each;v j amb "member,- said facing strips joining theiiacing'stripon the otheitjamb member "along jan iiregular "zig mag line; and

comers-beads extending: upwardly :along; the'corner'of said facing stripsaroundsaidarch blocksa i ai sa '2.'Mea'ns foriofming an archway ina-rectangulalr opening through a Wall comprising: side j ambs adapted to extend upwardly {along each side of said opening; a vertical slip joiritin said V sidejambsjto allow them'to'be adjustedto the thickness of said wall phead jambs extending in- V wardly from said side jambs alongthe top' of said opening; a similar slip joint between said hea'd jambs. to allowethe n to be 7 adjusted to: the thick-" ness' jof said wall; arch blocks inset into the cornersformedlby said side ,andhead' jambs; and coi' ner beads extending upwardly. along said side "jalnbs around said arch blocks and across said l3. Means for forming van archway" in a rec v tangular opening through a wall'comprising: side" jairibs adapted-to :extendjupwardly along each side of said; opening; "a vertical slip jointin said side jambs tojallow them to be adjusted to the thick- I ness of saidwall; head jambs extending inwardly V 'from-saijdTside jambs along thezton of" said opening;a;si1nila r slip joint between'said head jambs to allowither'n togbe adjusted to the. thickness of;

said wall; arch bloclzsginset '-into,:the corners formedby said side and .he'ad-jambs; and corner beads extending npwardlyf along :said side jambs:

each other from opposite co r nerbeads to form- @m W Y" e h 55 Pass jecting in vt :oppositestrip atintervals so asto form an 'iirj e li ai jdining i l-tqaccommodate the width :adji s'tmentd o f said j-arnb membe 's; '5 I HANSNQHRISTENSENV arch blocks ;-and-;ac'ros's said head i 1 jambs;g faq1ng;: strips; extending inwardly toward- 

